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Tyagi M, Casalini R, Roland CM. SHORT TIME AND STRUCTURAL DYNAMICS IN POLYPROPYLENE GLYCOL NANOCOMPOSITE. RUBBER CHEMISTRY AND TECHNOLOGY 2017. [DOI: 10.5254/rct.17.82664] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
ABSTRACT
The dynamics of polypropylene glycol, both neat and attached to silica nanoparticles, were investigated using elastic neutron backscattering and dielectric spectroscopy. The mean square displacement measured by the former is suppressed by the particles at temperatures corresponding to a dielectric secondary relaxation (that involves only a portion of the repeat unit) and the segmental relaxation (glass transition). Despite the suppression of the displacements, the motions are faster in the nanocomposite, primarily due to poorer packing (lower density) at the particle interface. At very low temperatures we discovered a new dynamic process in the polymer. Reflecting its very local nature, this process is unaffected by attachment of the chains to the silica.
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Affiliation(s)
- M. Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899-6102
- Department of Materials Science, University of Maryland, College Park, MD 20742
| | - R. Casalini
- Naval Research Laboratory, Chemistry Division, Washington, DC 20375-5342
| | - C. M. Roland
- Naval Research Laboratory, Chemistry Division, Washington, DC 20375-5342
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Mathlouthi C, Hugenell F, Delpech F, Rharbi Y. Heat Capacity of Confined Polystyrene in Close-Packed Particles. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b02326] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chourouk Mathlouthi
- Univ. Grenoble Alpes−LRP, F-38041 Grenoble, France
- CNRS, LRP, F-38041 Grenoble, France
| | - Frederic Hugenell
- Univ. Grenoble Alpes−LRP, F-38041 Grenoble, France
- CNRS, LRP, F-38041 Grenoble, France
| | - Françoise Delpech
- Univ. Grenoble Alpes−LRP, F-38041 Grenoble, France
- CNRS, LRP, F-38041 Grenoble, France
| | - Yahya Rharbi
- Univ. Grenoble Alpes−LRP, F-38041 Grenoble, France
- CNRS, LRP, F-38041 Grenoble, France
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Beena Unni A, Vignaud G, Bal JK, Delorme N, Beuvier T, Thomas S, Grohens Y, Gibaud A. Solvent Assisted Rinsing: Stability/Instability of Ultrathin Polymer Residual Layer. Macromolecules 2016. [DOI: 10.1021/acs.macromol.5b02435] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- A. Beena Unni
- FRE
CNRS 3744, IRDL, Univ. Bretagne Sud, F-56100 Lorient, France
- International
and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, Kerala, 686560 India
| | - G. Vignaud
- FRE
CNRS 3744, IRDL, Univ. Bretagne Sud, F-56100 Lorient, France
| | - J. K. Bal
- Centre
for Research in Nanoscience and Nanotechnology, University of Calcutta, Technology Campus,
Block JD2, Sector III, Saltlake City, Kolkata 700098, India
| | - N. Delorme
- LUNAM
Université, IMMM, Faculté de Sciences, UMR 6283 CNRS, Université du Maine, Le Mans, Cedex 9, 72000, France
| | - T. Beuvier
- LUNAM
Université, IMMM, Faculté de Sciences, UMR 6283 CNRS, Université du Maine, Le Mans, Cedex 9, 72000, France
| | - S. Thomas
- International
and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, Kerala, 686560 India
| | - Y. Grohens
- FRE
CNRS 3744, IRDL, Univ. Bretagne Sud, F-56100 Lorient, France
| | - A. Gibaud
- LUNAM
Université, IMMM, Faculté de Sciences, UMR 6283 CNRS, Université du Maine, Le Mans, Cedex 9, 72000, France
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